I suspect I have viruses in my MacBook.?

Only run RESET TO ZERO SAFARI, am i going to delete and also damage this MS Expression files, or maybe my jpg pictures, or the applications

Sophos Anti-Virus intended for Mac
Dwelling Edition >
http://www.sophos.com/en-us/products/free-tools/sophos-antivirus-for-mac-home-edition.aspx

(it’s free)

.

You may burn all your personal files to a CD such as those through MS Phrase and JPG’s.Once you’ve made sure there is a safe back-up copy, that can be done whatever you want with the pc.Reinstall via scratch if you have to.You can copy your files again later anyway on the backup COMPACT DISK.

It depends on what kind of viruses.